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S&P 500 ETF vs. Dow Jones ETF: What's the Difference? (SPY, DIA)

S&P 500 ETF vs. Dow Jones ETF: What's the Difference? (SPY, DIA)

The SPDR S&P 500 ETF (SPY) tracks 500 companies from the S&P 500 index while the SPDR Dow Jones Industrial Average ETF (DIA) tracks 30 of the largest companies in the U.S. Although they share similarities, each ETF is constructed differently.